Dynamic modeling analysis of oxygen solubility levels in shrimp aquaculture ponds

Abstract

Dissolved oxygen is a crucial parameter in shrimp aquaculture. The objective of this research is to determine the level of oxygen solubility and its impact on the intensive shrimp farming cycle based on dynamic modeling system analysis. The research method employed a causal ex-post facto design concept and data analysis using dynamic modeling systems. The results indicate that water quality parameters during the shrimp culture period are relatively stable, including pH (7.9-8.0), salinity (28 gr/L), DO (5.25-5.31 mg/L), temperature (29.8-30°C), CO3 (4-11 mg/L), HCO3 (98-103 mg/L), CaCO3 (106-110 mg/L), PO4 (0.199-0.380 mg/L), NO2 (0.053-0.093 mg/L), TAN (0.025-0.071 mg/L), organic matter (82.42-87.15 mg/L), and total bacteria (1.06E+05-2.76E+05 cell/ml). The oxygen solubility level in the model description is depicted as oscillating with concentrations ranging 0.00-7.00 mg/L/hour. The majority of oxygen solubility is obtained from the use of paddle aerators, capable of producing oxygen within the range of 0.5-8.0 mg/L. The estimated amount of aquaculture waste ranges from 2,500-7,500 g/m2. The highest oxygen carrying capacity for waste decomposition is 9 mg/L. Shrimp growth rate will decline to 0.00 gr/day when dissolved oxygen remains stagnant. The estimated shrimp harvest biomass based on dissolved oxygen carrying capacity and dynamic model analysis is 6 tons/ha. The conclusion, dissolved oxygen solubility fluctuates dynamically and exhibits a significant correlation with aquaculture waste accumulation, as well as with the subsequent reduction in shrimp growth rates under suboptimal environmental conditions. The fluctuation in oxygen solubility follows the temperature distribution pattern and the intensity of paddle aerator usage in the ponds.